body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #0A1F3E;
  color: #FFFFFF;
  line-height: 1.6;
}

a {
  color: #00A0E9;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.banner {
  text-align: center;
  padding: 60px 20px;
  background: linear-gradient(135deg, #0A1F3E, #003366);
}

.banner h1 {
  font-size: 2.5rem;
  margin: 0;
}

.banner p {
  font-size: 1.2rem;
  color: #F0F0F0;
}

.features {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  padding: 40px 0;
}

.feature {
  text-align: center;
  max-width: 300px;
  margin: 20px;
}

.feature img {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
}

.feature h2 {
  font-size: 1.5rem;
  margin: 10px 0;
}

.feature p {
  color: #F0F0F0;
}

.screenshots {
  text-align: center;
  padding: 40px 20px;
  background: #003366;
}

.screenshots h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.screenshot-grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.screenshot-grid img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

.screenshot-grid img:hover {
  transform: scale(1.05);
}

.download {
  text-align: center;
  padding: 40px 20px;
  background: #003366;
}

.download-btn {
  display: inline-block;
  padding: 15px 30px;
  margin: 0 10px;
  font-size: 1.2rem;
  color: #FFFFFF;
  background: linear-gradient(135deg, #00A0E9, #0077B6);
  border-radius: 50px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #2C8EFF, #0066CC);
}

.btn-baidu {
  background: linear-gradient(135deg, #2C8EFF, #0066CC);
}

.download-btn:hover {
  transform: scale(1.05);
}

.testimonials {
  padding: 40px 20px;
  background: #0A1F3E;
}

.testimonial {
  background: #003366;
  padding: 20px;
  border-radius: 10px;
  margin: 20px 0;
}

.testimonial p {
  margin: 0;
}

.testimonial span {
  display: block;
  margin-top: 10px;
  color: #00A0E9;
  font-weight: bold;
}

.sponsor {
  padding: 40px 20px;
  background: #0A1F3E;
  text-align: center;
}

.sponsor-box {
  max-width: 400px;
  margin: 0 auto;
  padding: 30px;
  background: #003366;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.sponsor h2 {
  font-size: 1.8rem;
  color: #00A0E9;
  margin-bottom: 15px;
}

.sponsor p {
  color: #F0F0F0;
  margin: 10px 0;
}

.qrcode {
  width: 200px;
  height: 200px;
  margin: 20px auto;
  border: 2px solid #00A0E9;
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.qrcode:hover {
  transform: scale(1.05);
}

.qrcode img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

footer {
  text-align: center;
  padding: 20px;
  background: #003366;
  color: #F0F0F0;
}

footer a {
  color: #00A0E9;
}

.navbar {
  background: #0A1F3E;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 10px;
  z-index: 1001;
  position: relative;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 2px;
  background: #fff;
  margin: 5px 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
  width: 25px;
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-20px);
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -4px);
  width: 25px;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: #FFFFFF;
  text-decoration: none;
  font-size: 1.1rem;
  transition: 0.3s;
  padding: 5px 10px;
}

.nav-links a:hover,
.nav-links a.active {
  color: #00A0E9;
  text-decoration: underline;
}

.tutorial-header {
  text-align: center;
  padding: 80px 20px 40px;
  background: linear-gradient(135deg, #0A1F3E, #003366);
}

.tutorial-header h1 {
  font-size: 2.5rem;
  margin: 0;
  color: #00A0E9;
}

.tutorial-list {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
}

.tutorial-item {
  background: #003366;
  border-radius: 10px;
  padding: 20px;
  margin: 20px 0;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.tutorial-item:hover {
  transform: translateY(-5px);
}

.tutorial-item h2 {
  color: #00A0E9;
  margin: 0 0 10px 0;
}

.tutorial-link {
  display: inline-block;
  color: #FFFFFF;
  text-decoration: none;
  padding: 8px 20px;
  background: rgba(0, 160, 233, 0.2);
  border-radius: 20px;
  transition: background 0.3s ease;
}

.tutorial-link:hover {
  background: #00A0E9;
}

@media (max-width: 768px) {
  .banner h1 {
    font-size: 2rem;
  }

  .banner p {
    font-size: 1rem;
  }

  .feature {
    max-width: 100%;
  }

  .download-buttons {
    flex-direction: column;
    gap: 15px;
  }

  .download-btn {
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    box-sizing: border-box;
  }

  .screenshot-grid img {
    max-width: 90%;
  }

  .sponsor-box {
    width: 90%;
    padding: 20px;
  }

  .qrcode {
    width: 180px;
    height: 180px;
  }

  .hamburger {
    display: block;
  }

  .hamburger span {
    width: 22px;
    margin: 4px 0;
  }

  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -5px);
  }

  .nav-links {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #0A1F3E;
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  }

  .nav-links.active {
    max-height: 300px;
  }

  .nav-links a {
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-links a:hover {
    background: rgba(255, 255, 255, 0.05);
  }

  .tutorial-header h1 {
    font-size: 2rem;
  }

  .tutorial-item {
    padding: 15px;
  }
}